Multifocal telescope.



P. B. WARNER@ MULTIFOGAL TBLESGOPB.

APPLICATION FILED `0OT.8, 1913.

1,088,494.` v Patented 111910.24, 1914,

By i; M

ATTORNEYS lffltiflfBD STATES PATENT FFGE.

FRANKLIN BROCKWAY WARNER, OF NEW YORK, N. Y., ASSIGNOR T0 KIRTLAND BROS. c CO., 0F NEW YORK, N. Y.

MULTIFOCAL TELESCOPE.

Losetas.

Specification of Letters Patent.

Application filed October 8, 1913. Serial No. 794,033.

To @ZZ cli/tom 'it' may concern.'

Be it known that I, FRANKLIN B. l/Vnn- NER, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and fmproved Multifocal Telescope, of which the following is a full, clear, and exact description.

rihe invention relates to telescopes having a tube made in telescoping sections to allow of extending or folding the sections.

The object of the invention is to provide a new and improved multi-focal telescope arranged to permit the convenient use of interchangeable objective lenses of more or less magnifying power and different focal length and to allow changing the length of the tube to correspond to the focal length of the obj ective, the tube sections being firmly held in the adjusted positions.

fn order to accomplish the desired result use is made of a tube consisting of sections telescoping one in the other, the sections being tapering and made of a material capable of graduallj7 contracting in drawing out the sections to hold the sections firmly in place on being drawn out mo-re or less according to the focal length of the objective used at the time. Use is also made of lenses of different magnifying power and focal length and interchangeably held in the cell of the objective and a diaphragm held lengthwise adjustable in the tube of the terrestrial eye nece. l A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a side elevation ofthe multifecal telescope with parts of the sections broken ont; F ig. 2 is an enlarged longitudinal central section of the terrestrial eyepiece provided with an adjustable diaphragm; Fig. 3 is a cross section of the same on the line 3 3 of Fig. 2; Fig. t is a longitudinal central section of a modified form of the terrestrial eyepiece; and Fig. 5 is an enlarged longitudinal central section of t-he objective on the end of the outermost tube section.

fhe tube of the telesco-pe is formed of a series of conical sections A, A, A2, A3, and an end section AAbt of cylindrical shape, the sections telescoping one in the other, and the sections being made of stiff paper or similar material capable of gradually contracting on drawing out the sections to hold the sections firmly in place on being drawn out more or less. The first section A is provided with a terrestrial eyepiece B and the last section AA1 1s provided at its outer end with an objective C consisting of a cell C in which is removably held an objective C2 by the use of a split ring C3 engaging the outer face of the lens C2 on pressing the same onto the annular seat CA1 formed on the cell C, as plainly indicated in Fig. 5. By the arrangement described the lens C2 can be readily removed and replaced by ano-ther of different magnifying power and focal length.

. rilhe terrestrial eyepiece B is provided at its ends with the usual lenses D and E, of

lwhich the lens D is seated on a ring D held in the outer end of the tube B of the terrestrial eyepiece B, and the lens D is held against the said ring by a split ring D2 (see Fig. 2). The outer lens E of the eyepiece B is seated on a ring E held within a short tube B2 remoifably fitted into the outer end of the tube B, and the said lens E is held against the ring E by a split ring E3. The short tube F2 is provided at the outside with a shoulder EL to limit the inward movement of the short tube E2 in the outer end of the tube B.

Intermediate the lenses D and E is arranged a diaphragm F held lengthwise adjustable in the tube B. For the purpose mentioned the diaphragm F is provided with a flange F irregularly corrugated to render the flange sufficiently flexible with a view to bear against the inner wall of the tube B to hold the diaphragm F in the adjusted position. The flange F is provided with diametrically disposed outwardly eX- tending lugs F2 projecting into elongated slots B2 formed in the tube B to permit the user of the telescope to take hold of the lugs F2 with a view to push the diaphragm F forward or backward in the tube B to adjust the diaphragm. according to the focal length of the objective lens U2 used at the time in the objective C. It is understood that for the purpose mentionedL the tube B is drawn out of the tube section A and after the desired adjustment has been made the tube B is replaced in the tube section A. The outer end of the tube B is provided with a collar B3 adapted to abut against the Patented ret. ee, 1ere.

outer end of the tube section A so as to hold the terrestrial eyepiece B in proper position in the tube section A.

ln the modihed form sho :vn in Fig. l the diaphragm F is provided with the corrugated flange li" but the lugs F2 are omitted, and in this case use is made of a hook G adapted to be passed into the tube E from the outer end thereof after the tube E2 and its lens E have been removed from the tube B. The hook G serves te move the diaphragm F forward or backward in the tube B to adjust the diaphragm F according to the focal length of the objective lens C2 used at the time.

Each of the sections A, A', A?. and i3 is provided with stop marks H, H, spaced suitable distances apart to permit the user of the telescope to draw out the sections il, A, A2 and A3 the desired length according to the focal length of the objective lens C2 used at the time. rlhus if the focal length of the objective lens C2 used at the time is say 2li inches then the sections A, i, ri and A3 are drawn out until the stop marks H register with the adjacent end of the next following section, it being understood that when the several sections have been drawn out as described the sections are in proper position for a lens C2 of 2d inches focal length. ln this case the diaphragm F is shifted outward to the position shown in dotted lines in Fig. 2. ln ease the objective lens C2 is of 36 inches focal length then the several sections A, A', Ef and A3 are drawn out until the stop marks H register with the adjacent ends of the next following sections, the tube then being extended for a lens of 3G inches focal length. lThe diaphragm F in this case is shifted to the position shown in Fig. Q so as to be in proper position in the eyepiece for an objective of 36 inches focal length.

From the foregoing it will be seen that by the arrangement described interchangeable objective lenses of more or less magnifying power and diderent focal length can be used in the telescope, a proper adjustment being made, however, of the diaphragm F in the eyepiece lt will also be noticed that by making the sections il, A, A2, A3 conical or slightly tapering and of a somewhat pliable material, it is evident that the sections can be drawn out either for the long or short focus at the same time, however, hclding the sections firmly in the adjusted position.

It is understood that when a section is drawn out the paper material contracts or yields sufficiently to allow of drawing out nosa/loe the section to the desired distance, and the farther the section is drawn out the firmer it is held in the next following section in which it is snugly fitted to slide.

Having thus described my invention, l claim as new and desire to secure by Letters Patent:

l. telescope, comprising a tube made in sections telescoping one in the other, the sections being tapering and made of a material capable of gradually contracting on drawing out the sections to hold the sections firmly in place on being drawn out more or less, a cell attached to the outer end of the last tube section, an objective lens held removable in the said cell, and a terrestrial eyepiece held in the rst tube section and provided with a lengthwise adjustable diaphragm to permit of adjusting the diaphragm to objective lenses of ditl'erentfocal lengths.

Q. .fr telescope, comprising a tube made in sect-ions, a cell attached to the outer end of 'the last tube section, an objective lens held removable in the said cell, and a terrestrial eyepiece held in the first tube section and provided with a lengthwise adjustable diaphragm to permit of adjusting the diaphragm to objective lenses of dii''erent focal lengths.

3. A telescope, comprising a tube made in sections, a cell attached to the outer end of the last tube section, an objective lens held removable in the said cell, a terrestrial eyepiece held in the first tube section and provided with a lengthwise adjusta le diaphragm to permit of adjusting toe diaphragm to objective lenses of diiierent focal lengths, and manually-controlled means for adjusting the said diaphragm.

l. A telescope, comprising a tube made in sections, a cell attached to the outer end of the last tube section, an objective lens held removable in the said cell, spaced stop marks on each of the said tube sections to permit of drawing out the sections for different focal lengths of the objective lens, and a terrestrial yepiece held in the focal tube section and irovided with a lengthwise adjustable diaohragm to permit of adjusting the diaphragm to objective lenses of different focal lengths.

ln testimony whereof l have name to this specification in the wo subscribing witnesses.

Fltilllllilll BROCKWAY WRUER.

signed my resence of nrorinr, Gao. W. Bnrrnmvs.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Entente. Washington, D. G.

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